EP 2656020 B1 20200401 - THERMAL FLOW MEASURING DEVICE
Title (en)
THERMAL FLOW MEASURING DEVICE
Title (de)
THERMISCHES DURCHFLUSSMESSGERÄT
Title (fr)
DÉBITMÈTRE THERMIQUE
Publication
Application
Priority
- DE 102010064127 A 20101223
- EP 2011070853 W 20111123
Abstract (en)
[origin: WO2012084396A1] The invention relates to a thermal flow measuring device and to a method for operating a thermal flow measuring device for determining the flow of a measurement medium through a measurement tube, wherein a constant heating current lh of a first current source flows through a first resistor during a heating phase of prescribed length th during a first measurement cycle, said first resistor being exposed to the measurement medium, wherein a constant measurement current lm of a second current source flows through the first resistor during a first measurement phase of prescribed length tr,1 during the first measurement cycle, wherein a first voltage Ur,1 drops across the first resistor during the first measurement phase tr,1, wherein the constant measurement current lm of the second current source flows through a second resistor during a second measurement phase of prescribed length tr,2 during the first measurement cycle, said second resistor being exposed to the measurement medium, wherein a second voltage Ur,2 drops across the second resistor during the second measurement phase tr,2, wherein the constant heating current lh of the first current source flows through a shunt resistor during the heating phase th, wherein a fifth voltage Uh,5 drops across the shunt resistor during the heating phase th, wherein at least the first voltage Ur,1, the second voltage Ur,2, and the fifth voltage Ur,5 are incorporated in the calculation of the flow rate, and wherein the constant heating current lh of the first current source flows through a bypass resistor during the first measurement phase tr,1.
IPC 8 full level
G01F 1/696 (2006.01); G01F 1/698 (2006.01)
CPC (source: EP US)
G01F 1/69 (2013.01 - US); G01F 1/696 (2013.01 - EP US); G01F 1/698 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2012084396 A1 20120628; DE 102010064127 A1 20120628; EP 2656020 A1 20131030; EP 2656020 B1 20200401; US 2013283904 A1 20131031; US 9228871 B2 20160105
DOCDB simple family (application)
EP 2011070853 W 20111123; DE 102010064127 A 20101223; EP 11801994 A 20111123; US 201113996254 A 20111123